Display panel, display device, display method and color convertor

Abstract

The present disclosure provides a display device and display method. The display device includes: a first display structure and a second display structure. The second display structure is disposed on a first light exiting side of the first display structure. A quantum rod layer that is disposed on a second light exiting side of the second display structure. The first display structure is configured to convert an incident blue light ray into a linearly polarized blue light, and control a luminance of the first display structure by controlling a deflection angle of liquid crystal of the first display structure. The second display structure receives the linearly polarized blue light that exits from the first display structure, and changes polarization state of the linearly polarized blue light incident to the quantum rod layer by controlling deflection angle of liquid crystal of the second display structure, to in turn change a color of the light ray that exits from the quantum rod layer.

What is claimed is: 
     
       1. A display panel, comprising:
 a first display structure, comprising a first liquid crystal layer; 
 a second display structure, on the first display structure, the second display structure comprising a second liquid crystal layer; and 
 a quantum rod layer on a side of the second display structure distal to the first display structure; wherein: 
 wherein the first display structure is configured to convert an incident blue light ray into a linearly polarized blue light, and control a luminance of the first display structure by controlling deflection angles of liquid crystals in the first liquid crystal layer; 
 the second display structure is configured to receive the linearly polarized blue light that exits from the first display structure, and change polarization direction of the linearly polarized blue light incident to the quantum rod layer by controlling deflection angles of liquid crystals in the second liquid crystal layer; 
 the display panel comprises a plurality of pixels, a respective one of the plurality of pixels consisting of a first independently addressable subpixel and a second independently addressable subpixel, the first independently addressable subpixel and the second independently addressable subpixel are configured to display a full-color RGB pixel image; 
 the quantum rod layer in the first independently addressable subpixel consists of red light emitting quantum rods; 
 the quantum rod layer in the second independently addressable subpixel consists of green light emitting quantum rods; 
 a first color of light emitted from the red light emitting quantum rods of the first independently addressable subpixel is independently tunable by independently changing a first polarization direction of the linearly polarized blue light incident to the first independently addressable subpixel to a second polarization direction; and 
 a second color of light emitted from the green light emitting quantum rods of the second independently addressable subpixel is independently tunable by independently changing a third polarization direction of the linearly polarized blue light incident to the second independently addressable subpixel to a fourth polarization direction. 
 
     
     
       2. The display panel according to  claim 1 , wherein:
 the display panel is absent of any polarizer between the second liquid crystal layer and the quantum rod layer. 
 
     
     
       3. The display panel according to  claim 1 , wherein,
 the quantum rod layer comprises a red quantum rod unit and a green quantum rod unit; 
 the red quantum rod unit comprises a plurality of red quantum rods that are arranged in a first preset direction; 
 the green quantum rod unit comprises a plurality of green quantum rods that are arranged in a second preset direction; 
 when polarization directions of the linearly polarized blue lights that are incident to the red quantum rod unit and the green quantum rod unit are respectively perpendicular to arrangement directions of the quantum rods of the red quantum rod unit and the green quantum rod unit, both of the colors of the light rays that exit from the red quantum rod unit and the green quantum rod unit of the quantum rod layer are blue; and 
 when polarization directions of the linearly polarized blue lights that are incident to the red quantum rod unit and the green quantum rod unit are respectively parallel to arrangement directions of the quantum rods of the red quantum rod unit and the green quantum rod unit, the color of the light ray that exits from the red quantum rod unit of the quantum rod layer is red, and the color of the light ray that exits from the green quantum rod unit of the quantum rod layer is green. 
 
     
     
       4. The display panel according to  claim 1 , wherein the first display structure comprises:
 a first substrate that is disposed on a first side of the first display structure; 
 a second substrate that is disposed on a second side of the first display structure, wherein the second substrate is arranged oppositely to the first substrate; 
 a first polarizer that is disposed on a first side of the first substrate; 
 a second polarizer that is disposed on a second side of the second substrate; 
 and 
 a first electrode assembly that is provided between the first substrate and the second substrate, wherein the first electrode assembly is used for controlling deflection angle of liquid crystal molecules of the first liquid crystal layer. 
 
     
     
       5. The display panel according to  claim 4 , wherein the first electrode assembly comprises:
 a first pixel electrode and a first common electrode; and 
 the first pixel electrode is disposed on the side of the first substrate that is facing the first liquid crystal layer, and the first common electrode is disposed on the side of the second substrate that is facing the first liquid crystal layer; or 
 the first pixel electrode and the first common electrode are disposed on the side of the first substrate that is facing the first liquid crystal layer; or 
 the first pixel electrode and the first common electrode are disposed on the side of the second substrate that is facing the first liquid crystal layer. 
 
     
     
       6. The display panel according to  claim 4 , wherein the second display structure comprises:
 a third substrate that is disposed on a first side of the second display structure; 
 a fourth substrate that is disposed on the second side of the second display structure, wherein the fourth substrate is arranged oppositely to the third substrate; 
 and 
 a second electrode assembly that is provided between the third substrate and the fourth substrate, for controlling deflection angle of liquid crystal molecules of the second liquid crystal layer. 
 
     
     
       7. The display panel according to  claim 6 , wherein the second electrode assembly comprises:
 a second pixel electrode and a second common electrode; and 
 the second pixel electrode is disposed on the side of the third substrate that is facing the second liquid crystal layer, and the second common electrode is disposed on the side of the fourth substrate that is facing the second liquid crystal layer. 
 
     
     
       8. The display panel according to  claim 6 , wherein the second electrode assembly comprises:
 a second pixel electrode and a second common electrode; and 
 the second pixel electrode and the second common electrode are disposed on the side of the third substrate that is facing the second liquid crystal layer. 
 
     
     
       9. The display panel according to  claim 6 , wherein the second electrode assembly comprises:
 a second pixel electrode and a second common electrode; and 
 the second pixel electrode and the second common electrode are disposed on the side of the fourth substrate that is facing the second liquid crystal layer. 
 
     
     
       10. The display panel according to  claim 6 , wherein the second substrate also serves as the third substrate. 
     
     
       11. The display panel according to  claim 1 , wherein the quantum rod layer comprises a material selected from a group consisting of CdS, CdSe, CdTe, and ZnSe. 
     
     
       12. A display device, comprising the display panel according to  claim 1 . 
     
     
       13. The display device according to  claim 12 , further comprising:
 a blue light backlight source to emit blue light to the first display structure. 
 
     
     
       14. A display method applied to a display panel:
 wherein the display panel comprises: 
 a first display structure, comprising a first liquid crystal layer; 
 a second display structure, on the first display structure, the second display structure comprising a second liquid crystal layer; and 
 a quantum rod layer on a side of the second display structure distal to the first display structure; wherein: 
 wherein the first display structure is configured to convert an incident blue light ray into a linearly polarized blue light, and control a luminance of the first display structure by controlling deflection angles of liquid crystals in the first liquid crystal layer; 
 the second display structure is configured to receive the linearly polarized blue light that exits from the first display structure, and change polarization direction of the linearly polarized blue light incident to the quantum rod layer by controlling deflection angles of liquid crystals in the second liquid crystal layer; 
 the display panel comprises a plurality of pixels, a respective one of the plurality of pixels consisting of a first independently addressable subpixel and a second independently addressable subpixel, the first independently addressable subpixel and the second independently addressable subpixel are configured to display a full-color RGB pixel image; 
 the quantum rod layer in the first independently addressable subpixel comprises red light emitting quantum rods; 
 the quantum rod layer in the second independently addressable subpixel comprises green light emitting quantum rods; 
 a first color of light emitted from the red light emitting quantum rods of the first independently addressable subpixel is independently tunable; and 
 a second color of light emitted from the green light emitting quantum rods of the second independently addressable subpixel is independently tunable; 
 wherein the method comprises: 
 converting a blue light ray that is incident to the first display structure into a linearly polarized blue light, and controlling at least one deflection angle of liquid crystals in the first liquid crystal layer of the first display structure, thereby controlling the luminance of the first display structure; and 
 receiving the linearly polarized blue light that exits from the first display structure, and controlling at least one deflection angle of liquid crystals in the second liquid crystal layer of the second display structure, thereby controlling the polarization direction of the linearly polarized blue light that is incident to the quantum rod layer, to change a color of the light ray that exits from the quantum rod layer; 
 wherein controlling the polarization direction of the linearly polarized blue light comprises: 
 independently changing a first polarization direction of the linearly polarized blue light incident to the first independently addressable subpixel to a second polarization direction; and 
 independently changing a third polarization direction of the linearly polarized blue light incident to the second independently addressable subpixel to a fourth polarization direction. 
 
     
     
       15. The display method according to  claim 14 , further comprising:
 controlling the first display structure that comprises a plurality of first pixels, wherein at least one first pixel consists of two subpixels; and 
 controlling the second display structure that comprises a plurality of second pixels, wherein at least one second pixel consists of two subpixels. 
 
     
     
       16. The display method according to  claim 14 , wherein converting a blue light ray that is incident to the first display structure into a linearly polarized blue light, and controlling the deflection angle of the liquid crystal of the first display structure, thereby controlling the luminance of the linearly polarized blue light that exits from the first display structure comprises:
 converting the blue light ray that is incident to the first display structure into a linearly polarized blue light by using the polarizer of the first display structure, and 
 by controlling voltages of a first pixel electrode and a first common electrode of a first electrode assembly, controlling the deflection angles of the liquid crystals, thereby controlling the luminance of the linearly polarized blue light that exits from the first display structure. 
 
     
     
       17. The display method according to  claim 14 , wherein controlling the deflection angle of the liquid crystal of the second display structure, thereby controlling the polarization direction of the linearly polarized blue light that is incident to the quantum rod layer, to in turn change a color of the light ray that exits from the quantum rod layer comprises:
 by controlling voltages of a second pixel electrode and a second common electrode of a second electrode assembly, controlling the deflection angle of the liquid crystal of the second display structure, thereby controlling the polarization direction of the linearly polarized blue light that is incident to the quantum rod layer, to in turn change a color of the light ray that exits from the quantum rod layer. 
 
     
     
       18. The display method according to  claim 17 , wherein the quantum rod layer comprises a red quantum rod unit and a green quantum rod unit. 
     
     
       19. The display method according to  claim 18 , wherein controlling the deflection angle of the liquid crystal of the second display structure, thereby controlling the polarization direction of the linearly polarized blue light that is incident to the quantum rod layer, to in turn change a color of the light ray that exits from the quantum rod layer comprises:
 controlling the liquid crystal of the second display structure that is corresponding to the red quantum rod unit to be deflected, to control a polarization direction of the linearly polarized blue light that is incident to the red quantum rod unit to be perpendicular to arrangement directions of the quantum rods of the red quantum rod unit, whereby the light ray that exits from the red quantum rod unit is blue. 
 
     
     
       20. A color convertor in a display panel, comprising:
 a display structure on the display panel comprising a liquid crystal layer; and 
 a quantum rod layer on a side of the display structure distal to the display panel; 
 wherein: 
 the display panel is configured to convert an incident blue light ray into a linearly polarized blue light, and control a luminance of the display structure; and 
 the display structure is configured to receive the linearly polarized blue light that exits from the display panel, and change polarization direction of the linearly polarized blue light incident to the quantum rod layer by controlling deflection angles of liquid crystals in the liquid crystal layer; 
 the display panel comprises a plurality of pixels, a respective one of the plurality of pixels consisting of a first independently addressable subpixel and a second independently addressable subpixel, the first independently addressable subpixel and the second independently addressable subpixel are configured to display a full-color RGB pixel image; 
 the quantum rod layer in the first independently addressable subpixel comprises red light emitting quantum rods; 
 the quantum rod layer in the second independently addressable subpixel comprises green light emitting quantum rods; 
 a first color of light emitted from the red light emitting quantum rods of the first independently addressable subpixel is independently tunable by independently changing a first polarization direction of the linearly polarized blue light incident to the first independently addressable subpixel to a second polarization direction; and 
 a second color of light emitted from the green light emitting quantum rods of the second independently addressable subpixel is independently tunable by independently changing a third polarization direction of the linearly polarized blue light incident to the second independently addressable subpixel to a fourth polarization direction.